Q:
Q: Spark plug popping out

Hello. This is a common problem on the Ford modular V8. The new spark plug won’t stay because the threads are stripped out. There are two repairs: 1) drilling, and installing a threaded insert into the head for the spark plug, or 2) removing the head and having the same procedure done at a machine shop. This is usually done if the first one fails. You will probably need to take it to a shop that has performed this repair before, since they will have the special tools needed to perform the on-car repair.

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